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This story appears to have been written by one of the Bronte sisters. The crazy foreign ex-wife in a far-off land and the eccentric fantasy-loving daughter of this Mr. Rochester.
Seriously, though, I suspect that the daughter too may have the potential to develop a mental illness and need lifelong support.
The ball is in the LW's court. If she stays, she should not expect dramatic change, but then again, the experience may be rewarding.